<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            width: 100%;
            height: 1000px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .container {
            box-sizing: border-box;
            border: 1px #000 solid;
            width: 300px;
            height: 200px;

            /* 弹性布局 */
            display: flex;
            flex-direction: row;
            
        }
        .container .three {
            align-self: flex-end;
        }
        .container .item {
            box-sizing: border-box;
            border: 1px #0b5e03 solid;
            background-color: #11bd58;
            width: 40px;
            height: 40px;
            font-size: 10px;
            flex: 1;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="item one">1</div>
        <div class="item two">2</div>
        <div class="item three">3</div>
        <div class="item four">4</div>
        <div class="item five">5</div>
    </div>
</body>
</html>